Portable rotary grinder



FIG. 1 is a top, front and right-side perspective view of a portable rotary grinder showing my new design;

FIG. 2 is a front elevational view thereof; the rear elevational view being omitted since it is symmetric with respect to FIG. 2;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a right side elevational view thereof. 

The ornamental design for portable rotary grinder, as shown and described. 